IMR Press / FBL / Volume 12 / Issue 9 / DOI: 10.2741/2322

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
Nitrosative stress in cancer therapy
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1 School of Pharmacy, Medical Biology Centre, Queens University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, U.K.
Academic Editors:Olga Greco, Simon Scott
Front. Biosci. (Landmark Ed) 2007, 12(9), 3406–3418; https://doi.org/10.2741/2322
Published: 1 May 2007
(This article belongs to the Special Issue The tumor microenvironment as a target for therapy)
Abstract

Reactive nitrogen species play important roles in cell signalling, but when present at high concentrations they can subject cells to nitrosative stress, which may lead to cell death. Nitric oxide ((NO⋅) is now recognized as playing important roles in cancer aetiology and progression and it can influence the outcome of cancer treatment. It is synthesised by the action of nitric oxide synthases (NOSs) on the amino acid arginine. Although  is not highly reactive with biological molecules, it reacts readily with other oxygen radicals to generate highly damaging reactive nitrogen species such as peroxynitrite, nitrogen dioxide and dinitrogen trioxide. These are potent inducers of apoptosis and necrosis. They may also inhibit DNA repair mechanisms, leading to mutation and carcinogenesis. Both inhibition and over-production of NO⋅ have been investigated as strategies for cancer therapy. There is clear evidence that administration of competitive inhibitors of NOS can significantly slow the growth of solid tumors in rodent models, probably by reducing blood flow, and this creates a hypoxic environment that is conducive to the activation of bioreductive anticancer agents. Alternatively, generation of NO⋅ concentrations in the high micromolar range by NO⋅ donor drugs or gene therapy with inducible NOS is directly cytotoxic to cells and has been shown to inhibit tumor growth. At these high concentrations NO⋅ is also an excellent sensitizer to radiation and to some chemotherapeutic agents, particularly cisplatin. Thus, manipulation of NO⋅ levels in tumors offers exciting opportunities to improve the effectiveness of cancer treatment.

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